Officials from South Korean companies set to participate in an economic project between Pyongyang and Moscow will visit North Korea this week for an on-site inspection, the government said Sunday.

The unification ministry said 18 officials from three South Korean firms will visit North Korea’s northeastern part of Rajin from Tuesday to Thursday. The companies are state-run Korea Railroad Corp. (KORAIL), top steelmaker POSCO and No. 2 shipper Hyundai Merchant Marine. No government official will join the trip, the ministry said.